The only thing the fed model does is help compare competing investments. What will one do with their money. Put it in real estate. Not likely as highly valued as that is right now. Put it in 1% short term instruments. If you like 1%. Put it into 3% to 4% bonds. Not me. Put it in high quality stocks with earnings yields of 5% (a 20 PE, decreasing as earnings increase) and 1.5% dividend yield, and then let them accumulate (appreciation) tax free. Sounds like Warren Buffett's equity/bond, doesn't it.